CN112943387A - Steam source control method and steam source control device - Google Patents
Steam source control method and steam source control device Download PDFInfo
- Publication number
- CN112943387A CN112943387A CN202110359639.9A CN202110359639A CN112943387A CN 112943387 A CN112943387 A CN 112943387A CN 202110359639 A CN202110359639 A CN 202110359639A CN 112943387 A CN112943387 A CN 112943387A
- Authority
- CN
- China
- Prior art keywords
- steam
- main pipe
- extraction
- supply
- auxiliary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000000605 extraction Methods 0.000 claims abstract description 181
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 147
- 238000002955 isolation Methods 0.000 claims description 42
- 230000008569 process Effects 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 6
- 238000011946 reduction process Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010977 unit operation Methods 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 9
- 230000009467 reduction Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000000740 bleeding effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention provides a steam source control method and a steam source control device, which are used for determining normal steam supply of an auxiliary steam main pipe and a four-stage steam extraction main pipe; based on the real-time acquisition the operating load of coal-fired unit the pressure value of the main pipe of the auxiliary steam with the pressure value of the main pipe of the grade four extraction steam, adjust the main pipe of the auxiliary steam with the aperture of the steam supply isolating valve on the main pipe of the grade four extraction steam and the aperture of the main steam valve on the steam inlet pipeline, so as to control the main pipe of the auxiliary steam with the main pipe of the grade four extraction steam to the steam supply of the water feed pump steam turbine is in the preset steam supply interval. The invention has the advantages of simple operation and high reliability, and improves the economic performance of the unit operation and reduces the production cost on the basis of ensuring the normal and safe operation of the unit.
Description
Technical Field
The invention relates to the technical field of generator set control, in particular to a steam source control method and a steam source control device.
Background
The generating set of coal fired power plant can reduce the generated energy during the power consumption valley, can make the unit load reduce when reducing the generated energy, and reduce the unit load and can exert an influence to the vapour source supply mode of coal group self, can lead to the waste of the energy to there is certain potential safety hazard.
The water supply pump turbine in the generating set drives the water supply pump to supply water required by the boiler to the boiler under the action of steam, under the normal condition, the water supply pump turbine of the coal-fired generating set supplies steam through four-stage air extraction and reheat cooling section steam, when the load of the generating set is high, the water supply pump turbine mainly supplies steam through four-stage air extraction, but after the load of the generating set is reduced, the water supply pump turbine mainly supplies steam through reheat cooling section steam, and the reheat cooling section steam supplies steam, the cost is high, and because a certain pressure difference exists between the four-stage air extraction and the reheat cooling section steam, after the load is changed, in the steam source switching process, the switching of a steam source can be delayed, so that the steam supply amount is changed, the water supply amount of the water supply pump is fluctuated, and the normal and safe operation of the generating set is threatened.
Disclosure of Invention
The invention aims to provide a steam source control method and a steam source control device, which at least solve the problems of high steam supply cost and fluctuation in steam source switching.
In order to achieve the above object, a first aspect of the present invention provides a steam source control method for controlling a steam source of a feed pump steam turbine in a load reduction process of a coal-fired unit, where the feed pump steam turbine is connected to an auxiliary steam main pipe and a four-stage steam extraction main pipe through a steam inlet pipeline, the steam inlet pipeline is provided with a main steam valve, and the auxiliary steam main pipe is connected to a standby steam source and the four-stage steam extraction main pipe; each pipeline is provided with a steam supply isolation valve and a check valve; the auxiliary steam main pipe is used for conveying reheat cold section steam for supplying steam to the water feeding pump steam turbine; four-stage extraction steam is conveyed in the four-stage extraction steam main pipe and is used for supplying steam to the water supply pump steam turbine; the method comprises the following steps:
determining normal steam supply of the auxiliary steam main pipe and the four-stage steam extraction main pipe;
based on the real-time acquisition the operating load of coal-fired unit the pressure value of the main pipe of the auxiliary steam with the pressure value of the main pipe of the grade four extraction steam, adjust the main pipe of the auxiliary steam with the aperture of the steam supply isolating valve on the main pipe of the grade four extraction steam and the aperture of the main steam valve on the steam inlet pipeline, so as to control the main pipe of the auxiliary steam with the main pipe of the grade four extraction steam to the steam supply of the water feed pump steam turbine is in the preset steam supply interval.
Optionally, the preset steam supply interval is determined by the operation load of the coal-fired unit.
Optionally, determining the preset steam supply interval according to the operation load of the coal-fired unit includes:
determining the water flow required by the coal-fired unit based on the operation load of the coal-fired unit;
determining the water supply flow required by the water supply pump turbine to the coal-fired unit based on the water supply flow required by the coal-fired unit;
and determining the preset steam supply interval based on the water supply flow.
Optionally, based on obtain in real time the coal-fired unit the operating load the pressure value of the main pipe of the auxiliary steam with the pressure value of the main pipe of the grade four extraction steam, the adjustment the main pipe of the auxiliary steam with the aperture of the steam supply isolation valve on the main pipe of the grade four extraction steam and the aperture of the main steam valve on the steam inlet pipeline, in order to control the main pipe of the auxiliary steam with the main pipe of the grade four extraction steam to the steam supply of water-feeding pump steam turbine is in and predetermines the steam supply interval, include:
if the operation load of coal-fired unit is in predetermineeing the first load interval, just the pressure value of the female pipe of level four extraction of steam is greater than assist the pressure value of the female pipe of steam, close supply vapour isolating valve on the female pipe of auxiliary steam, the adjustment the aperture of the main vapour valve on the main pipe of the steam supply isolating valve on the level four extraction of steam and the admission pipeline to control the level four extraction of steam female pipe to the steam supply volume of water-feeding pump steam turbine is in predetermineeing the steam supply volume interval.
Optionally, the method further includes:
if the operation load of the coal-fired unit is in a preset second load interval, and the pressure value of the four-stage steam extraction main pipe is smaller than the pressure value of the auxiliary steam main pipe, acquiring the temperature value of the auxiliary steam main pipe:
if the temperature value of the auxiliary steam main pipe is larger than or equal to a preset temperature threshold value, closing a steam supply isolation valve on the four-stage steam extraction main pipe, and adjusting the opening of the steam supply isolation valve on the auxiliary steam main pipe and the opening of a main steam valve on a steam inlet pipeline so as to control the steam supply amount of the auxiliary steam main pipe to the water feed pump steam turbine to be in a preset steam supply amount interval;
if the temperature value of the auxiliary steam main pipe is smaller than a preset temperature threshold value, generating an alarm;
wherein the first load interval is greater than the second load interval.
Optionally, close supply vapour isolating valve on the main pipe of auxiliary steam adjusts the aperture of the main steam valve on the main pipe of supply vapour isolating valve on the level four extraction steam and the admission pipeline to control the level four extraction steam main pipe to supply the vapour volume of water-feeding pump steam turbine is in and predetermines the supply vapour volume interval, includes:
at time T1And the opening degree of a steam supply isolating valve on the auxiliary steam main pipe is adjusted to 0% by the current opening degree, and the opening degree of the steam supply isolating valve on the four-stage steam extraction main pipe and the opening degree of a main steam valve on the steam inlet pipeline are increased simultaneously to control the four-stage steam extraction main pipe to the steam supply quantity of the water supply pump steam turbine is in a preset steam supply quantity interval.
Optionally, close supply vapour isolating valve on the female pipe of level four extraction of steam, adjustment supply the aperture of vapour isolating valve and the main steam valve aperture on the admission pipeline on the female pipe of auxiliary steam, in order to control the female pipe of auxiliary steam to supply the vapour volume of water-feeding pump steam turbine is in and predetermines the steam volume interval that supplies, includes:
at time T2And the opening degree of the steam supply isolating valve on the four-stage steam extraction main pipe is adjusted to 0% by the current opening degree, and is increased simultaneously, the opening degree of the steam supply isolating valve on the auxiliary steam main pipe and the opening degree of the main steam valve on the steam inlet pipeline are reduced, so that the four-stage steam extraction main pipe controls the steam supply quantity of the water supply pump steam turbine to be within a preset steam supply quantity interval.
Optionally, at time T2In, the degree of opening of the steam supply isolating valve on the four-stage air extraction main pipe, the degree of opening of the steam supply isolating valve on the auxiliary steam main pipe and the degree of opening of the main steam valve on the steam inlet pipeline are as follows:
wherein,
is the flow of steam entering the steam turbine of the feed pump, and
in the interval of the preset steam supply amount,
the flow rate of the steam supplied to the feed pump turbine by the four-stage steam extraction main pipe,
the flow rate of the steam supplied to the feed pump turbine by the auxiliary steam main pipe,
K1the opening degree of a steam supply isolation valve on the four-stage steam extraction main pipe and the flow coefficient of the four-stage steam extraction main pipe are obtained;
K2the opening degree of a steam supply isolation valve on the auxiliary steam main pipe and the flow coefficient of the auxiliary steam main pipe are obtained;
K3the opening degree of a main steam valve on the steam inlet pipeline and the flow coefficient of the steam inlet pipeline.
The second aspect of the invention provides a steam source control device, which is used for controlling a steam source of a water supply pump steam turbine in the process of reducing load or stopping a coal-fired unit, wherein the water supply pump steam turbine is connected with an auxiliary steam main pipe and a four-stage steam extraction main pipe through a steam inlet pipeline, a main steam valve is arranged on the steam inlet pipeline, and the auxiliary steam main pipe is connected with a standby steam source and the four-stage steam extraction main pipe; each pipeline is provided with a steam supply isolation valve and a check valve; the auxiliary steam main pipe is used for conveying reheat cold section steam for supplying steam to the water feeding pump steam turbine; four-stage extraction steam is conveyed in the four-stage extraction steam main pipe and is used for supplying steam to the water supply pump steam turbine; the control device includes:
the determining module is used for determining normal steam supply of the auxiliary steam main pipe and the four-stage steam extraction main pipe;
the adjustment module, based on obtain in real time the coal-fired unit the operating load the pressure value of the female pipe of auxiliary steam with the pressure value of the female pipe of level four extraction steam, the adjustment the female pipe of auxiliary steam with the aperture of the steam supply isolation valve on the female pipe of level four extraction steam and the aperture of the main steam valve on the admission pipeline, in order to control the female pipe of auxiliary steam with the female pipe of level four extraction steam to the steam supply of feed water pump steam turbine is in predetermines the steam supply interval.
In another aspect, the present disclosure provides a machine-readable storage medium having instructions stored thereon for causing a machine to perform the steam source control method described herein.
The technical scheme provides a steam source control method in the process of load reduction of a coal burner set, a water feeding pump steam turbine is connected with an auxiliary steam main pipe and a four-stage steam extraction main pipe through a steam inlet pipeline, the auxiliary steam main pipe for conveying reheating cold section steam and the four-stage steam extraction main pipe for conveying four-stage extracted steam supply steam to the water feeding pump steam turbine, in the process of load reduction of the coal burner set, the opening degrees of steam supply isolation valves on the auxiliary steam main pipe and the four-stage steam extraction main pipe and the opening degree of a main steam valve on the steam inlet pipeline are adjusted through the operation load of the coal burner set, the pressure value of the auxiliary steam main pipe and the pressure value of the four-stage steam extraction main pipe, the switching and the adjustment of a steam source of the water feeding pump steam turbine are carried out, the adaptability of the steam source of the water feeding pump steam turbine can be optimized, in the process of switching the steam source, the steam inlet quantity of the water feeding pump steam turbine is controlled, the operation is simple, the running economy of the unit is improved, and the production cost is reduced.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of a steam source control method provided by the present invention;
FIG. 2 is a schematic view of the gas supply connection structure of the coal-fired unit provided by the present invention;
fig. 3 is a schematic structural diagram of a steam source control device provided by the invention.
Description of the reference numerals
10-a determination module; 20-adjusting module.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
FIG. 1 is a flow chart of a steam source control method provided by the present invention; FIG. 2 is a schematic view of the gas source connection structure of the coal-fired unit provided by the invention. As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a steam source control method for controlling a steam source of a feed water pump turbine in a load reduction or shutdown process of a coal-fired unit, where the feed water pump turbine is connected to an auxiliary steam main pipe and a fourth-stage steam extraction main pipe through a steam inlet pipe, the steam inlet pipe is provided with a main steam valve, and the auxiliary steam main pipe is connected to a standby steam source and the fourth-stage steam extraction main pipe; each pipeline is provided with a steam supply isolation valve and a check valve; the auxiliary steam main pipe is used for conveying reheat cold section steam for supplying steam to the water feeding pump steam turbine; four-stage extraction steam is conveyed in the four-stage extraction steam main pipe and is used for supplying steam to the water supply pump steam turbine; the method comprises the following steps:
102, adjusting the opening degree of a steam supply isolation valve on the auxiliary steam main pipe and the opening degree of a main steam valve on a steam inlet pipeline based on the real-time acquired operation load of the coal-fired unit, the pressure value of the auxiliary steam main pipe and the pressure value of the four-stage steam extraction main pipe so as to control the steam supply amount of the auxiliary steam main pipe and the four-stage steam extraction main pipe to the water supply pump steam turbine to be within a preset steam supply amount interval.
Specifically, in the process of reducing load of the coal burner group or stopping the coal burner group, a four-stage steam extraction main pipe and an auxiliary steam main pipe are generally adopted as steam sources to supply steam to the water feeding pump steam turbine, but because the steam source of the auxiliary steam main pipe is mainly cold-end reheated steam, the cost is high, if the steam is supplied by always using the method, the air supply cost is high, and therefore, the optimization of the steam supply source needs to be performed in the process of reducing load of the coal burner group.
According to the technical scheme of the invention, firstly, the normal steam supply of the auxiliary steam main pipe and the four-stage steam extraction main pipe needs to be determined, then the operation load of the coal-fired unit, the pressure value of the auxiliary steam main pipe and the pressure value of the four-stage steam extraction main pipe are obtained in the process of reducing the load of the coal-fired unit, and the opening degree of a steam supply isolation valve on the auxiliary steam main pipe, the opening degree of a steam supply isolation valve on the four-stage steam extraction main pipe and the opening degree of a main steam valve on a steam inlet pipeline are synchronously adjusted according to the operation load of the coal-fired unit, the pressure value of the auxiliary steam main pipe and the pressure value of the four-stage steam extraction main pipe so as to control the steam supply amount of the auxiliary steam main pipe and the four-stage steam extraction main pipe to the water feed pump turbine to be in a preset steam supply interval, thereby avoiding the boiler from tripping caused by fluctuation of the water supply amount in the adjusting process, in the adjusting process, the air supply quantity of the water supply pump turbine is ensured to be switched stably, and the phenomenon that the flow of the water supply pump turbine is too small and the friction heat between the water supply and the impeller is not taken away by the water supply because the air supply quantity of the water supply pump turbine is too small, so that the cavitation of the water supply pump of the turbine is avoided; and the phenomenon that the motor is over-current or even burnt out due to overload of the water feeding pump caused by overlarge air supply amount of the steam turbine of the water feeding pump can be avoided.
Except controlling the steam supply quantity of the water pump turbine, the vibration condition of the water pump turbine can be monitored in real time, and if the water pump turbine is monitored to generate continuous abnormal vibration, maintenance measures can be taken.
Further, the preset steam supply interval is determined by the operation load of the coal-fired unit.
Specifically, because the operating load of the coal-fired unit is reduced, the water consumption required by the coal-fired unit is also gradually reduced until the load is reduced to a certain value, and the water consumption of the coal-fired unit is stabilized on a certain numerical value, the water consumption can be determined according to the load value of the coal-fired unit.
Further, determining the preset steam supply interval according to the operation load of the coal-fired unit comprises:
determining the water flow required by the coal-fired unit based on the operation load of the coal-fired unit;
determining the water supply flow required by the water supply pump turbine to the coal-fired unit based on the water supply flow required by the coal-fired unit;
and determining the preset steam supply interval based on the water supply flow.
Specifically, the preset steam supply interval is determined according to the operation load of the coal-fired unit, the water consumption of the coal-fired unit can be determined according to the operation load of the coal-fired unit, the water consumption of a boiler is mainly expressed as the water consumption of the boiler, and the water supply of the boiler is provided by a water-feeding pump turbine, so that the water supply quantity of the water-feeding pump turbine can be adjusted by adjusting the steam inlet quantity of the water-feeding pump turbine, historical data can be collected according to the corresponding relation, the data is analyzed and summarized to obtain a corresponding table of the load of the coal-fired unit and the water for the boiler, and then the corresponding relation of the load of each coal-fired unit and the water for the boiler is obtained by reading the; in another embodiment, the corresponding relation between the coal-fired unit and the water supply amount and the air supply amount can be obtained according to historical data information, and finally an equation corresponding to the operation load of the coal-fired unit and the water inflow of the water supply pump steam turbine is obtained.
Because the corresponding conversion efficiency of the different models of water feeding pump turbines is different, for the water feeding pump turbines with different signals, under the condition that parameters such as external input steam flow, pressure, enthalpy value, temperature and the like are the same, the water feeding quantity output by the water feeding pump turbines are different to a certain extent, therefore, when the preset air supply interval is determined through the water feeding quantity, the corresponding relation between the air inflow quantity and the water feeding quantity of the water feeding pump turbines needs to be determined, in the embodiment, the corresponding relation between the air inflow quantity and the water feeding quantity can be obtained by obtaining multiple sets of historical data and analyzing the historical data.
Further, based on the real-time acquisition the operating load of coal-fired unit, the pressure value of the main pipe of auxiliary steam with the pressure value of the main pipe of level four extraction steam, the adjustment the main pipe of auxiliary steam with the aperture of the steam supply isolation valve on the main pipe of level four extraction steam and the aperture of the main steam valve on the steam admission pipeline, in order to control the main pipe of auxiliary steam with the main pipe of level four extraction steam to the steam supply of water-feeding pump steam turbine is in and predetermines the steam supply interval, include:
if the operation load of coal-fired unit is in predetermineeing the first load interval, just the pressure value of the female pipe of level four extraction of steam is greater than assist the pressure value of the female pipe of steam, close supply vapour isolating valve on the female pipe of auxiliary steam, the adjustment the aperture of the main vapour valve on the main pipe of the steam supply isolating valve on the level four extraction of steam and the admission pipeline to control the level four extraction of steam female pipe to the steam supply volume of water-feeding pump steam turbine is in predetermineeing the steam supply volume interval.
Further, if the operation load of the coal-fired unit is in a preset second load interval, and the pressure value of the four-stage steam extraction main pipe is smaller than the pressure value of the auxiliary steam main pipe, acquiring the temperature value of the auxiliary steam main pipe:
if the temperature value of the auxiliary steam main pipe is larger than or equal to a preset temperature threshold value, closing a steam supply isolation valve on the four-stage steam extraction main pipe, and adjusting the opening of the steam supply isolation valve on the auxiliary steam main pipe and the opening of a main steam valve on a steam inlet pipeline so as to control the steam supply amount of the auxiliary steam main pipe to the water feed pump steam turbine to be in a preset steam supply amount interval;
if the temperature value of the auxiliary steam main pipe is smaller than a preset temperature threshold value, generating an alarm;
wherein the first load interval is greater than the second load interval.
Specifically, when a coal-fired unit operates, steam in a four-stage steam extraction main pipe is supplied by steam generated by combustion of a unit boiler, and when the load of the unit is reduced, the steam amount generated by the boiler is reduced, so when the pressure of the four-stage steam extraction main pipe is reduced to be smaller than that of an auxiliary steam main pipe, a steam source of a water pump steam turbine is switched to the auxiliary steam main pipe for steam supply, but the steam production cost in the auxiliary steam main pipe is high, therefore, the pressure of the four-stage steam extraction main pipe is required to be smaller than that of the auxiliary steam main pipe, but the water supply stage that the water supply pump steam turbine works to provide enough water for the boiler can be met, the steam source of the water supply pump steam turbine is kept to be steam supplied by the four-stage steam extraction main pipe, the pressure value of the four-stage steam extraction main pipe is reduced to be low, before the working of the water supply pump steam turbine can not be met, the steam source of the water supply pump is converted to be, The pressure value of the four-stage steam extraction main pipe and the auxiliary steam main pipe is combined and judged, the steam supply isolation valve and the adjustment on the four-stage steam extraction main pipe are adjusted, the opening degree of the steam supply isolation valve on the auxiliary steam main pipe and the opening degree of the main steam valve on a steam inlet pipeline are adjusted, and therefore the auxiliary steam main pipe is ensured, and the steam supply amount of the water supply pump steam turbine is within a preset steam supply amount interval.
And the pressure value of the four-stage steam extraction main pipe is greater than that of the auxiliary steam main pipe, the steam supply isolating valve on the auxiliary steam main pipe is closed, the pressure value of the four-stage steam extraction main pipe can be limited to be greater than the pressure value of the auxiliary steam extraction main pipe by a preset pressure interval, in the embodiment, when the pressure value of the four-stage steam extraction main pipe is greater than that of the auxiliary steam extraction main pipe, and when the difference value between the pressure value of the four-stage steam extraction main pipe and the pressure value of the auxiliary steam extraction main pipe is within a preset pressure interval, then closing the steam supply isolating valve on the auxiliary steam main pipe to avoid cutting off the steam supply isolating valve on the auxiliary steam main pipe too early, only adopting a four-stage steam extraction main pipe to supply steam to the water supply pump steam turbine, when the pressure in the four-stage steam extraction main pipe changes, the feed water flow of the unit is abnormal, and the boiler tripping protection is triggered.
Specifically, as the operating load of the coal-fired unit continues to decrease, the steam generated by the boiler is not enough to make the steam of the four-stage steam extraction main pipe satisfy the lowest steam pressure value, at this time, the air source needs to be switched to the auxiliary steam extraction main pipe for steam supply, therefore, in this process, the temperature value of the auxiliary steam extraction main pipe needs to be obtained in advance, when the temperature value of the auxiliary steam extraction main pipe is greater than or equal to the preset temperature threshold value, the steam supply isolation valve on the four-stage steam extraction main pipe is directly closed, the opening degree of the steam supply isolation valve on the auxiliary steam extraction main pipe and the opening degree of the main steam valve on the steam inlet pipeline are adjusted to control the steam supply amount of the auxiliary steam extraction main pipe to the water feeding pump turbine to be in the preset steam supply amount interval, if the temperature value of the auxiliary steam extraction main pipe is too low, the steam temperature supplied to the water feeding pump turbine becomes low, resulting in low temperature of, make the water-feeding pump steam turbine do work ability variation, the water-feeding pump is exerted oneself and is reduced by a wide margin, leads to the boiler inflow flow unusual, leads to the tripping operation, consequently, can not switch over the air supply to the female pipe of auxiliary steam and supply vapour this moment, produces the warning, and need carry out the temperature value of operation such as drainage in order to increase the female pipe of auxiliary steam through adjusting the steam trap, carry out the hydrophobic back of adjusting, make the temperature value more than or equal to of the female pipe of auxiliary steam predetermine the temperature threshold value after, continue the switching of vapour source again.
Further, close the steam supply isolating valve on the auxiliary steam main pipe, adjust the aperture of the steam supply isolating valve on the four-stage steam extraction main pipe and the aperture of the main steam valve on the steam inlet pipeline, so as to control the four-stage steam extraction main pipe to the steam supply of the water feed pump steam turbine is in a preset steam supply interval, and the method comprises the following steps:
at time T1And the opening degree of a steam supply isolating valve on the auxiliary steam main pipe is adjusted to 0% by the current opening degree, and the opening degree of the steam supply isolating valve on the four-stage steam extraction main pipe and the opening degree of a main steam valve on the steam inlet pipeline are increased simultaneously to control the four-stage steam extraction main pipe to the steam supply quantity of the water supply pump steam turbine is in a preset steam supply quantity interval.
Specifically, at the time of steam source switching, the time T is set1Interior will the aperture of the steam supply isolating valve on the main pipe of auxiliary steam is adjusted to 0% by current aperture, avoids closing the time span overlength of the main pipe of auxiliary steam for the pressure value of the main pipe of level four extraction steam reduces to the pressure value that is less than the main pipe of auxiliary steam, and pressure difference increases gradually, increases the undulant possibility of admitting air in the accommodation process, and increases the steam source control degree of difficulty, wherein, time T1Is determined according to the pressure value of the four-stage steam extraction main pipe, the pressure value of the auxiliary steam extraction main pipe and the change rate of the pressure value of the four-stage steam extraction main pipe, and can be understood as that the opening degree of a steam supply isolation valve on the auxiliary steam extraction main pipe is adjusted from the beginning and the time T is passed1The pressure value of the rear four-stage steam extraction main pipe is still larger than or equal to the pressure value of the auxiliary steam extraction main pipe.
Along with the reduction of unit load, the steam supply pressure of the main pipe of the four-stage steam extraction is also reduced, but the auxiliary steam main pipe reduces or even does not supply steam to the water supply pump steam turbine, so that the water supply quantity of the water supply pump steam turbine can meet the corresponding water consumption of the boiler under the load, the opening degree of the steam supply isolation valve on the main pipe of the four-stage steam extraction and the opening degree of the main steam valve on the steam inlet pipeline need to be increased simultaneously, and in the process, the two water supply pump steam turbines normally supply water to the boiler.
Further, close supply vapour isolating valve on the female pipe of level four extraction of steam, the adjustment supply vapour isolating valve's on the female pipe of auxiliary steam openness and the main steam valve openness on the admission pipeline, in order to control the female pipe of auxiliary steam to supply the vapour volume of water-feeding pump steam turbine is in predetermineeing the steam volume interval that supplies, includes:
at time T2And the opening degree of the steam supply isolating valve on the four-stage steam extraction main pipe is adjusted to 0% by the current opening degree, and is increased simultaneously, the opening degree of the steam supply isolating valve on the auxiliary steam main pipe and the opening degree of the main steam valve on the steam inlet pipeline are reduced, so that the four-stage steam extraction main pipe controls the steam supply quantity of the water supply pump steam turbine to be within a preset steam supply quantity interval.
Specifically, along with coal-fired unit's operating load continues to reduce, the steam that final boiler produced is not enough to make the minimum steam pressure value in steam position of the female pipe of level four extraction, at this moment, need switch over the steam source from the female pipe of level four extraction to the female pipe steam supply of auxiliary steam in advance, and because the pressure value in the female pipe of level four extraction is lower, in order to satisfy the normal air input of unit, the aperture of the steam supply isolation valve on the female pipe of level four extraction at this moment and the main steam valve aperture on the admission pipeline are all great, however, in the switching process, need increase simultaneously and supply the isolation valve aperture on the female pipe of auxiliary steam, if supply the isolation valve aperture on the female pipe of auxiliary steam too big, cause the fluctuation of admitting air easily, therefore, inject and prescribe a limit to the time T of settlement2The interior completion is switched, will the aperture of the female pipe of confession vapour isolating valve on the level four bleeding is adjusted to 0% by current aperture, avoids closing the time span overlength of the female pipe of level four bleeding is closing the female pipe of confession vapour isolating valve on the level four bleeding increases among the accommodation processPossibility of intake air fluctuation and difficulty of control, wherein the time T2The setting of the four-stage steam extraction main pipe is determined according to the load value of the coal-fired unit and the change rate of the pressure in the four-stage steam extraction main pipe, if the load of the coal-fired unit is reduced quickly, the pressure change in the four-stage steam extraction main pipe is accelerated, and at the moment, the set time T is2Small, ensuring that the pressure value in the four-stage steam extraction main pipe is still greater than the minimum operation value after the adjustment is completed, specifically, in the prior art, the minimum inlet pressure at which the water supply pump turbine can operate is 0.2MPa, but when the unit load is about 150MW, the pressure level of the corresponding four-stage steam extraction main pipe is 0.2MPa, and the inlet pressure of the small engine is about 0.18MPa, so that the setting time T is set2The pressure in the four-stage steam extraction main pipe and the change rate thereof can be set, and the time T is elapsed from the moment of switching the steam source2And the pressure of the four-stage steam extraction main pipe is still greater than 0.2 MPa.
Will supply the in-process that vapour isolating valve on the female pipe of level four extraction reduces, need increase the aperture of the steam isolating valve of the female pipe of auxiliary steam, because the female pipe of auxiliary steam with the intraductal pressure of the female pipe of level four extraction this moment differs and strengthens, consequently, is increasing when supplying vapour isolating valve aperture on the female pipe of auxiliary steam, the aperture size of regulation and the speed of regulation all will be less than the speed and the aperture of the female pipe aperture of level four extraction reduction adjust the size, simultaneously, to the aperture of the main steam valve that reduces on the admission pipeline, in order to control the female pipe of level four extraction to the steam supply of feed pump steam turbine is in and predetermines the steam supply interval. Because the pressure of the four-stage steam extraction main pipe is lower, in order to meet the air inlet pressure of the water supply pump steam turbine, the opening degree of the steam supply isolation valve on the four-stage steam extraction main pipe and the opening degree of the main steam valve on the steam inlet pipeline are both larger, and therefore synchronous adjustment is needed.
In another kind of embodiment, also can adopt more convenient mode to adjust, if before the steam source switches, the aperture of the main steam valve on the admission pipeline is less than 50%, then can keep the aperture of the main steam valve on the admission pipeline is unchangeable, only through adjusting the aperture that supplies vapour isolating valve on the auxiliary steam main pipe carries out the air input and adjusts, at this moment, the speed of regulation of the aperture of supplying vapour isolating valve on the auxiliary steam main pipe and the aperture size of single regulation all need be less than the adoption and adjust the aperture of supplying vapour isolating valve on the auxiliary steam main pipe and the aperture of the main steam valve on the admission pipeline.
Further, at time T2In, the degree of opening of the steam supply isolating valve on the four-stage air extraction main pipe, the degree of opening of the steam supply isolating valve on the auxiliary steam main pipe and the degree of opening of the main steam valve on the steam inlet pipeline are as follows:
wherein,
is the flow of steam entering the steam turbine of the feed pump, and
in the interval of the preset steam supply amount,
the flow rate of the steam supplied to the feed pump turbine by the four-stage steam extraction main pipe,
the flow rate of the steam supplied to the feed pump turbine by the auxiliary steam main pipe,
K1the opening degree of a steam supply isolation valve on the four-stage steam extraction main pipe and the flow coefficient of the four-stage steam extraction main pipe are obtained;
K2the opening degree of a steam supply isolation valve on the auxiliary steam main pipe and the flow coefficient of the auxiliary steam main pipe are obtained;
K3the opening degree of a main steam valve on the steam inlet pipeline and the flow coefficient of the steam inlet pipeline.
In particular, lambda represents the load interval of different coal-fired units, from which it can be derived,
the steam flow entering a water feeding pump turbine when the coal-fired unit is in different load intervals,
the flow rate of the steam supplied to the water feeding pump turbine by the auxiliary steam main pipe in different load intervals,
the value of the flow coefficient can be determined according to historical data for the steam flow supplied to the feed pump turbine by the four-stage steam extraction main pipe in different load intervals.
Fig. 3 is a schematic structural diagram of a steam source control device provided by the present invention, and as shown in fig. 3, a second aspect of the present invention provides a steam source control device for controlling a steam source of a water-feeding pump turbine in a load reduction or shutdown process of a coal-fired unit, where the water-feeding pump turbine is connected to an auxiliary steam main pipe and a fourth-stage steam extraction main pipe through a steam inlet pipe, the steam inlet pipe is provided with a main steam valve, and the auxiliary steam main pipe is connected to a standby steam source and the fourth-stage steam extraction main pipe; each pipeline is provided with a steam supply isolation valve and a check valve; the auxiliary steam main pipe is used for conveying reheat cold section steam for supplying steam to the water feeding pump steam turbine; four-stage extraction steam is conveyed in the four-stage extraction steam main pipe and is used for supplying steam to the water supply pump steam turbine; the control device includes:
the determining module 10 is configured to determine that the auxiliary steam main pipe and the four-stage steam extraction main pipe supply steam normally;
adjusting module 20, based on obtain in real time the coal-fired unit the operating load the pressure value of the female pipe of auxiliary steam with the pressure value of the female pipe of level four extraction steam, the adjustment the female pipe of auxiliary steam with the aperture of the steam supply isolation valve on the female pipe of level four extraction steam and the aperture of the main steam valve on the admission pipeline, in order to control the female pipe of auxiliary steam with the female pipe of level four extraction steam to the steam supply volume of water-feeding pump steam turbine is in predetermines the steam supply volume interval.
In another aspect, the present invention also provides a machine-readable storage medium, where instructions are stored on the machine-readable storage medium, and the instructions are used to cause a machine to execute the steam source control method described in this application.
Example 1:
in this embodiment, take a 660MW unit as an example, the normal steam supply source is a four-stage extraction and auxiliary steam main pipe, the auxiliary boiler is used as a standby steam source, the auxiliary steam main pipe in the plant area is communicated and operated, the pressure setting value is 0.65MPa, and the temperature of each auxiliary steam header is greater than 250 ℃.
By adopting the steam source control method of the invention to carry out the optimization adjustment of the steam source in the process of reducing the load of the unit, the parameter tables before and after the steam source switching shown in the table 1 can be obtained, as shown in the following table 1:
| parameter(s) | After switching | Before switching |
| Load(s) | 303MW | 305MW |
| Steam inlet pressure of water supply pump steam turbine A | 0.43MPa | 0.58MPa |
| Steam inlet pressure of water supply pump steam turbine B | 0.43MPa | 0.59MPa |
| Steam inlet temperature of water supply pump steam turbine A | 362℃ | 289℃ |
| Steam inlet temperature of water supply pump steam turbine B | 362℃ | 289℃ |
| Inlet flow of small machine | 48t/h | 7.3t/h |
| Opening of main steam valve A of water supply pump steam turbine | 36 | 29 |
| Opening of main steam valve B of water supply pump steam turbine | 34 | 28 |
| Rotational speed of steam turbine A of feed pump | 3568 | 3507 |
| B rotation speed of water supply pump steam turbine | 3498 | 3428 |
| Steam discharge temperature of water supply pump steam turbine A | 43 | 28 |
| Steam discharge temperature of water supply pump steam turbine B | 35 | 24 |
| Auxiliary steam pressure | 0.71MPa | 0.65MPa |
| Four-pumping pressure | 0.49MPa | 0.5MPa |
TABLE 1 steam Source before and after switching parameter table
And data acquisition is carried out on the low-load value after the steam source switching, so as to obtain the low-load operation parameters after the steam source switching shown in the table 2, as shown in the following table 2:
| parameter(s) | After switching | After switching |
| Load(s) | 242MW | 210MW |
| Steam inlet pressure of water supply pump steam turbine A | 0.34MPa | 0.27MPa |
| Steam inlet pressure of water supply pump steam turbine B | 0.34MPa | 0.27MPa |
| Steam inlet temperature of water supply pump steam turbine A | 353℃ | 361℃ |
| Steam inlet temperature of water supply pump steam turbine B | 353℃ | 361℃ |
| Inlet flow of small machine | 43t/h | 48t/h |
| Opening of main steam valve A of water supply pump steam turbine | 35 | 40 |
| Opening of main steam valve B of water supply pump steam turbine | 33 | 38 |
| Rotational speed of steam turbine A of feed pump | 3322 | 3442 |
| B rotation speed of water supply pump steam turbine | 3253 | 3370 |
| Steam discharge temperature of water supply pump steam turbine A | 59 | 47 |
| Steam discharge temperature of water supply pump steam turbine B | 50 | 40 |
| Auxiliary steam pressure | 0.61MPa | 0.73MPa |
| Four-pumping pressure | 0.4MPa | 0.33MPa |
TABLE 2 Low load value after steam Source switching for data acquisition
It can be obtained from table 1 that, at a load of about 300MW, the steam source of the water supply pump steam turbine is supplied by the four-stage steam extraction main pipe, the steam inlet amount is 48t/h, and when the auxiliary steam main pipe is used for supplying steam, the air input is obviously increased, the steam inlet temperature of the two water supply pump steam turbines is 362 ℃, which is obviously higher than 289 ℃ when the auxiliary steam main pipe is used for supplying steam, the superheat degree of the steam source is obviously improved, and the work-applying capability is enhanced. Moreover, after the steam source is optimized, the operation parameters of the small turbine are all in a normal range, all the vibrations are not abnormally changed, the temperature of each bearing is normal, the exhaust steam temperature of the small turbine is respectively increased by 15 ℃ and 11 ℃, the opening degree of a main steam valve is increased by about 6 percent and all the operation parameters are changed in a normal range, and the normal operation of the unit can be met;
it can be obtained through table 2 that when the unit low-load operates, the comparison load is 242MW and 210MW, at this moment, the steam source of the feed water pump turbine is supplied by the four-stage steam extraction main pipe, and along with the load reduction of the unit, the pressure value of the four-stage steam extraction main pipe is reducing, at this moment, although the water consumption of the boiler is reducing, along with the inlet pressure of the feed water pump turbine also reducing, the inlet flow still needs to be increased, so as to control the steam supply of the auxiliary steam main pipe and the four-stage steam extraction main pipe to the feed water pump turbine to be in the preset steam supply interval, and guarantee the water supply.
At the working condition of 50 percent THA, when the steam source of the water feeding pump steam turbine is a four-stage steam extraction main pipe, the heat consumption rate is 8005.63kJ/kWh, when the auxiliary steam extraction main pipe is adopted for supplying steam, the heat consumption rate is 8040.69kJ/kWh, the difference is 35.06kJ/kWh, and about 1.3g/kWh of standard coal is saved in terms of saving, so that the production cost can be increased by adopting the auxiliary steam extraction main pipe for supplying steam for a long time, and the independent steam supply is carried out through the four-stage steam extraction main pipe, thereby being more favorable for improving the operation economy.
Those skilled in the art will appreciate that all or part of the steps in the method for implementing the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solution of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications are within the scope of the embodiments of the present invention. It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. A steam source control method is used for controlling a steam source of a water supply pump steam turbine in the load reduction process of a coal-fired unit, wherein the water supply pump steam turbine is connected with an auxiliary steam main pipe and a four-stage steam extraction main pipe through a steam inlet pipeline, a main steam valve is arranged on the steam inlet pipeline, and the auxiliary steam main pipe is connected with a standby steam source and the four-stage steam extraction main pipe; each pipeline is provided with a steam supply isolation valve and a check valve; the auxiliary steam main pipe is used for conveying reheat cold section steam for supplying steam to the water feeding pump steam turbine; four-stage extraction steam is conveyed in the four-stage extraction steam main pipe and is used for supplying steam to the water supply pump steam turbine; the control method is characterized by comprising the following steps:
determining normal steam supply of the auxiliary steam main pipe and the four-stage steam extraction main pipe;
based on the real-time acquisition the operating load of coal-fired unit the pressure value of the main pipe of the auxiliary steam with the pressure value of the main pipe of the grade four extraction steam, adjust the main pipe of the auxiliary steam with the aperture of the steam supply isolating valve on the main pipe of the grade four extraction steam and the aperture of the main steam valve on the steam inlet pipeline, so as to control the main pipe of the auxiliary steam with the main pipe of the grade four extraction steam to the steam supply of the water feed pump steam turbine is in the preset steam supply interval.
2. The steam source control method according to claim 1, wherein the preset steam supply interval is determined by an operating load of the coal-fired unit.
3. The steam source control method according to claim 2, wherein determining the preset steam supply interval according to the operating load of the coal-fired unit comprises:
determining the water flow required by the coal-fired unit based on the operation load of the coal-fired unit;
determining the water supply flow required by the water supply pump turbine to the coal-fired unit based on the water supply flow required by the coal-fired unit;
and determining the preset steam supply interval based on the water supply flow.
4. The steam source control method according to claim 1, wherein the adjusting of the opening degree of the steam supply isolation valves on the auxiliary steam main pipe and the four-stage steam extraction main pipe and the opening degree of the main steam valve on a steam inlet pipeline based on the real-time obtained operating load of the coal-fired unit, the pressure value of the auxiliary steam main pipe and the pressure value of the four-stage steam extraction main pipe to control the steam supply amount of the auxiliary steam main pipe and the four-stage steam extraction main pipe to the water-feeding pump turbine to be within a preset steam supply amount interval comprises:
if the operation load of coal-fired unit is in predetermineeing the first load interval, just the pressure value of the female pipe of level four extraction of steam is greater than assist the pressure value of the female pipe of steam, close supply vapour isolating valve on the female pipe of auxiliary steam, the adjustment the aperture of the main vapour valve on the main pipe of the steam supply isolating valve on the level four extraction of steam and the admission pipeline to control the level four extraction of steam female pipe to the steam supply volume of water-feeding pump steam turbine is in predetermineeing the steam supply volume interval.
5. The steam source control method of claim 4, further comprising:
if the operation load of the coal-fired unit is in a preset second load interval, and the pressure value of the four-stage steam extraction main pipe is smaller than the pressure value of the auxiliary steam main pipe, acquiring the temperature value of the auxiliary steam main pipe:
if the temperature value of the auxiliary steam main pipe is larger than or equal to a preset temperature threshold value, closing a steam supply isolation valve on the four-stage steam extraction main pipe, and adjusting the opening of the steam supply isolation valve on the auxiliary steam main pipe and the opening of a main steam valve on a steam inlet pipeline so as to control the steam supply amount of the auxiliary steam main pipe to the water feed pump steam turbine to be in a preset steam supply amount interval;
if the temperature value of the auxiliary steam main pipe is smaller than a preset temperature threshold value, generating an alarm;
wherein the first load interval is greater than the second load interval.
6. The steam source control method according to claim 5, wherein the closing of the steam supply isolation valve on the auxiliary steam main pipe, and the adjusting of the opening degree of the steam supply isolation valve on the four-stage steam extraction main pipe and the opening degree of the main steam valve on a steam inlet pipeline to control the steam supply amount of the four-stage steam extraction main pipe to the water supply pump turbine in a preset steam supply amount interval comprise:
at time T1And the opening degree of a steam supply isolating valve on the auxiliary steam main pipe is adjusted to 0% by the current opening degree, and the opening degree of the steam supply isolating valve on the four-stage steam extraction main pipe and the opening degree of a main steam valve on the steam inlet pipeline are increased simultaneously to control the four-stage steam extraction main pipe to the steam supply quantity of the water supply pump steam turbine is in a preset steam supply quantity interval.
7. The steam source control method according to claim 5, wherein the closing of the steam supply isolation valve on the four-stage steam extraction main pipe, and the adjusting of the opening of the steam supply isolation valve on the auxiliary steam main pipe and the opening of the main steam valve on a steam inlet pipeline to control the steam supply amount of the auxiliary steam main pipe to the water supply pump turbine to be in a preset steam supply amount interval comprise:
at time T2And the opening degree of the steam supply isolating valve on the four-stage steam extraction main pipe is adjusted to 0% by the current opening degree, and is increased simultaneously, the opening degree of the steam supply isolating valve on the auxiliary steam main pipe and the opening degree of the main steam valve on the steam inlet pipeline are reduced, so that the four-stage steam extraction main pipe controls the steam supply quantity of the water supply pump steam turbine to be within a preset steam supply quantity interval.
8. The steam source control method as recited in claim 7, characterized in that at time T2In, the degree of opening of the steam supply isolating valve on the four-stage air extraction main pipe, the degree of opening of the steam supply isolating valve on the auxiliary steam main pipe and the degree of opening of the main steam valve on the steam inlet pipeline are as follows:
wherein,
is steam entering a steam turbine of a feed pumpFlow rate of steam, and
in the interval of the preset steam supply amount,
the flow rate of the steam supplied to the feed pump turbine by the four-stage steam extraction main pipe,
the flow rate of the steam supplied to the feed pump turbine by the auxiliary steam main pipe,
K1the opening degree of a steam supply isolation valve on the four-stage steam extraction main pipe and the flow coefficient of the four-stage steam extraction main pipe are obtained;
K2the opening degree of a steam supply isolation valve on the auxiliary steam main pipe and the flow coefficient of the auxiliary steam main pipe are obtained;
K3the opening degree of a main steam valve on the steam inlet pipeline and the flow coefficient of the steam inlet pipeline.
9. A steam source control device is used for controlling a steam source of a water supply pump steam turbine in the process of reducing load or stopping a coal-fired unit, wherein the water supply pump steam turbine is connected with an auxiliary steam main pipe and a four-stage steam extraction main pipe through a steam inlet pipeline, a main steam valve is arranged on the steam inlet pipeline, and the auxiliary steam main pipe is connected with a standby steam source and the four-stage steam extraction main pipe; each pipeline is provided with a steam supply isolation valve and a check valve; the auxiliary steam main pipe is used for conveying reheat cold section steam for supplying steam to the water feeding pump steam turbine; four-stage extraction steam is conveyed in the four-stage extraction steam main pipe and is used for supplying steam to the water supply pump steam turbine; characterized in that the control device comprises:
the determining module is used for determining normal steam supply of the auxiliary steam main pipe and the four-stage steam extraction main pipe;
the adjustment module, based on obtain in real time the coal-fired unit the operating load the pressure value of the female pipe of auxiliary steam with the pressure value of the female pipe of level four extraction steam, the adjustment the female pipe of auxiliary steam with the aperture of the steam supply isolation valve on the female pipe of level four extraction steam and the aperture of the main steam valve on the admission pipeline, in order to control the female pipe of auxiliary steam with the female pipe of level four extraction steam to the steam supply of feed water pump steam turbine is in predetermines the steam supply interval.
10. A machine-readable storage medium having instructions stored thereon for causing a machine to perform the steam source control method of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110359639.9A CN112943387B (en) | 2021-04-02 | 2021-04-02 | Steam source control method and steam source control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110359639.9A CN112943387B (en) | 2021-04-02 | 2021-04-02 | Steam source control method and steam source control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112943387A true CN112943387A (en) | 2021-06-11 |
| CN112943387B CN112943387B (en) | 2023-03-21 |
Family
ID=76232203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110359639.9A Active CN112943387B (en) | 2021-04-02 | 2021-04-02 | Steam source control method and steam source control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112943387B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464213A (en) * | 2021-07-23 | 2021-10-01 | 中国能源建设集团华中电力试验研究院有限公司 | Steam-driven water feed pump control method, module and system for thermal generator set |
| CN115217530A (en) * | 2022-07-22 | 2022-10-21 | 西安西热锅炉环保工程有限公司 | Steam-driven feed water pump steam source switching system and method adapting to deep peak regulation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104131846A (en) * | 2014-07-14 | 2014-11-05 | 国家电网公司 | Steam source automatic switching device and method applied to 300 MW turboset steam-driven water feed pump |
| CN206972325U (en) * | 2017-07-13 | 2018-02-06 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of small turbine vapour source automatically switches and regulating system |
| JP2019214975A (en) * | 2018-06-13 | 2019-12-19 | 株式会社東芝 | Drive system of boiler feed pump drive turbine |
| CN110985139A (en) * | 2019-12-17 | 2020-04-10 | 浙江浙能技术研究院有限公司 | Small machine steam admission control device and method based on application of standby steam source |
| CN211287801U (en) * | 2019-12-17 | 2020-08-18 | 浙江浙能技术研究院有限公司 | Small machine steam inlet control device based on application of standby steam source |
| CN212454562U (en) * | 2020-06-15 | 2021-02-02 | 国网湖北省电力有限公司电力科学研究院 | Coal fired power plant feed pump steam turbine steam supply pipeline system with stable steam source switching |
-
2021
- 2021-04-02 CN CN202110359639.9A patent/CN112943387B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104131846A (en) * | 2014-07-14 | 2014-11-05 | 国家电网公司 | Steam source automatic switching device and method applied to 300 MW turboset steam-driven water feed pump |
| CN206972325U (en) * | 2017-07-13 | 2018-02-06 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of small turbine vapour source automatically switches and regulating system |
| JP2019214975A (en) * | 2018-06-13 | 2019-12-19 | 株式会社東芝 | Drive system of boiler feed pump drive turbine |
| CN110985139A (en) * | 2019-12-17 | 2020-04-10 | 浙江浙能技术研究院有限公司 | Small machine steam admission control device and method based on application of standby steam source |
| CN211287801U (en) * | 2019-12-17 | 2020-08-18 | 浙江浙能技术研究院有限公司 | Small machine steam inlet control device based on application of standby steam source |
| CN212454562U (en) * | 2020-06-15 | 2021-02-02 | 国网湖北省电力有限公司电力科学研究院 | Coal fired power plant feed pump steam turbine steam supply pipeline system with stable steam source switching |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464213A (en) * | 2021-07-23 | 2021-10-01 | 中国能源建设集团华中电力试验研究院有限公司 | Steam-driven water feed pump control method, module and system for thermal generator set |
| CN115217530A (en) * | 2022-07-22 | 2022-10-21 | 西安西热锅炉环保工程有限公司 | Steam-driven feed water pump steam source switching system and method adapting to deep peak regulation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112943387B (en) | 2023-03-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112943387B (en) | Steam source control method and steam source control device | |
| JP3800384B2 (en) | Combined power generation equipment | |
| JP2680033B2 (en) | Method and apparatus for operating combined plant | |
| CN108868908A (en) | Control method, device and the backheat small turbine system of backheat small turbine | |
| CN113107623A (en) | Device and method for improving heat supply steam extraction parameters during low-load operation of double-low-pressure-cylinder steam turbine | |
| CN209978005U (en) | Primary frequency modulation control system for secondary reheating unit | |
| CN108779688B (en) | The control method of electricity generation system and electricity generation system | |
| CN111608928A (en) | Energy-saving optimization method for controlling opening and closing of recirculation valve of steam turbine feed pump | |
| JP6290652B2 (en) | Power generation system and method for controlling power generation system | |
| CN108779687B (en) | Exhaust heat recovery device, internal combustion engine system, ship, and method for controlling exhaust heat recovery device | |
| JP3959172B2 (en) | Steam turbine control method | |
| CN214660397U (en) | Device for improving heat supply steam extraction parameters during low-load operation of double-low-pressure-cylinder steam turbine | |
| WO2019010992A1 (en) | Turbine cooling control method and device for gas turbine, and storage medium | |
| JP2002106305A (en) | Starting controller of combined cycle power generation plant | |
| CN112833453B (en) | No. 0 high-voltage power supply optimization control system based on multi-data judgment | |
| CN106321173B (en) | Method for cutting off steam side valve of low-pressure heater to participate in primary frequency modulation loading of unit | |
| JPH08260907A (en) | Steam storing electric power plant | |
| KR102055378B1 (en) | How to cool a steam turbine | |
| JP2005214047A (en) | Combined cycle power generation plant and method of operating the same | |
| JP2020045826A (en) | Steam system | |
| CN113091037B (en) | Coal-fired unit shutdown optimization control method and control device | |
| CN114458399B (en) | Monitoring control system and method for low-pressure cylinder low-flow operation of steam turbine | |
| SU1163045A1 (en) | Method of controlling capacity of high-pressure boiler supercharging compressor | |
| Di et al. | Research on Exhaust Steam Temperature Automatic Control of Ultra-supercritical Unit | |
| JPS59180014A (en) | Method of controlling load in combined cycle power plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |